[DRE-maint] Bug#830317: gem2deb is failing to build handlebars_assets as gem

[Pirate Praveen]

package: gem2deb
version: 0.31

With export DH_RUBY = --gem-install added to debian/rules, I get the
following error

	dh_ruby --install
/home/pravi/forge/debian/git/pkg-ruby-extras/ruby-handlebars-assets/debian/ruby-handlebars-assets
   dh_ruby --install
/usr/bin/ruby2.3 -S gem build --config-file /dev/null --verbose
/tmp/d20160708-14769-1oh9rg8/gemspec
Failed to load /dev/null because it doesn't contain valid YAML hash
WARNING:  See http://guides.rubygems.org/specification-reference/ for help
ERROR:  While executing gem ... (Gem::InvalidSpecificationException)
    ["bin/"] are not files
/usr/lib/ruby/vendor_ruby/gem2deb.rb:56:in `run': /usr/bin/ruby2.3 -S
gem build --config-file /dev/null --verbose
/tmp/d20160708-14769-1oh9rg8/gemspec (Gem2Deb::CommandFailed)
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:156:in `gem'
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:64:in `block (2
levels) in install_files_and_build_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:63:in `chdir'
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:63:in `block in
install_files_and_build_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:38:in `each'
	from /usr/lib/ruby/vendor_ruby/gem2deb/gem_installer.rb:38:in
`install_files_and_build_extensions'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:84:in `block in install'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:82:in `each'
	from /usr/lib/ruby/vendor_ruby/gem2deb/dh_ruby.rb:82:in `install'
	from /usr/bin/dh_ruby:94:in `<main>'
dh_auto_install: dh_ruby --install
/home/pravi/forge/debian/git/pkg-ruby-extras/ruby-handlebars-assets/debian/ruby-handlebars-assets
returned exit code 1
debian/rules:7: recipe for target 'binary' failed
make: *** [binary] Error 1
dpkg-buildpackage: error: fakeroot debian/rules binary gave error exit
status 2

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